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https://gitlab.com/sheaf/metabrush.git
synced 2024-11-05 14:53:37 +00:00
improve offset tangent calculation
This commit is contained in:
sheaf
parent
808e37b1b3
commit
1c6f751a2b
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@ -214,8 +214,8 @@ main = do
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maxHistorySizeTVar <- STM.newTVarIO @Int 1000
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fitParametersTVar <- STM.newTVarIO @FitParameters
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( FitParameters
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{ maxSubdiv = 3
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, nbSegments = 13
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{ maxSubdiv = 5
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, nbSegments = 12
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, dist_tol = 5e-3
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, t_tol = 1e-4
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, maxIters = 100
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@ -157,7 +157,7 @@ modifyingCurrentDocument uiElts@( UIElements { viewport = Viewport {..}, .. } )
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coerce ( updateUIAction uiElts vars )
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SaveDocument Nothing -> do
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STM.modifyTVar' openDocumentsTVar ( Map.adjust affirmPresent unique )
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pure ( pure () )
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coerce ( updateUIAction uiElts vars )
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SaveDocument ( Just newFilePath ) -> do
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STM.modifyTVar' openDocumentsTVar
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( Map.adjust
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@ -167,7 +167,7 @@ modifyingCurrentDocument uiElts@( UIElements { viewport = Viewport {..}, .. } )
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)
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unique
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)
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pure ( pure () )
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coerce ( updateUIAction uiElts vars )
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UpdateDocumentTo ( TrivialChange { newDocument } ) -> do
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STM.modifyTVar' openDocumentsTVar
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( Map.adjust ( set ( field' @"present" ) newDocument ) unique )
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@ -430,20 +430,30 @@ drawStroke
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:: Colours -> Bool -> Double
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-> ( Either ( Seq ( StrokePoint () ) ) ( Seq ( StrokePoint () ), Seq ( StrokePoint () ) ), Seq FitPoint )
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-> Cairo.Render ()
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drawStroke cols@( Colours { brushStroke } ) debug zoom strokeData = do
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drawStroke cols@( Colours {..} ) debug zoom strokeData = do
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Cairo.save
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withRGBA brushStroke Cairo.setSourceRGBA
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case strokeData of
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( Left outline, fitPts ) -> do
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go outline
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Cairo.fill
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when debug do
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case debug of
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False -> Cairo.fill
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True -> do
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Cairo.fillPreserve
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withRGBA brushCenter Cairo.setSourceRGBA
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Cairo.setLineWidth ( 2 / zoom )
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Cairo.stroke
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( `evalStateT` 0 ) $ traverse_ ( drawFitPoint cols zoom ) fitPts
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( Right ( fwd, bwd ), fitPts ) -> do
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go fwd
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go bwd
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Cairo.fill
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when debug do
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case debug of
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False -> Cairo.fill
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True -> do
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Cairo.fillPreserve
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withRGBA brushCenter Cairo.setSourceRGBA
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Cairo.setLineWidth ( 2 / zoom )
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Cairo.stroke
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( `evalStateT` 0 ) $ traverse_ ( drawFitPoint cols zoom ) fitPts
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Cairo.restore
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@ -478,7 +488,7 @@ drawFitPoint :: Colours -> Double -> FitPoint -> StateT Double Cairo.Render ()
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drawFitPoint ( Colours {..} ) zoom ( FitPoint { fitPoint = Point2D x y } ) = do
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hue <- get
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put ( hue + 0.01 )
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put ( hue + 0.002 )
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let
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r, g, b :: Double
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( r, g, b ) = hsl2rgb hue 0.9 0.4
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@ -493,7 +503,7 @@ drawFitPoint ( Colours {..} ) zoom ( FitPoint { fitPoint = Point2D x y } ) = do
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drawFitPoint ( Colours {..} ) zoom ( FitTangent { fitPoint = Point2D x y, fitTangent = Vector2D tx ty } ) = do
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hue <- get
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put ( hue + 0.01 )
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put ( hue + 0.002 )
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let
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r, g, b :: Double
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( r, g, b ) = hsl2rgb hue 0.9 0.4
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@ -91,10 +91,10 @@ data FitParameters
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data FitPoint
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= FitPoint
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{ fitPoint :: Point2D Double }
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{ fitPoint :: !( Point2D Double ) }
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| FitTangent
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{ fitPoint :: Point2D Double
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, fitTangent :: Vector2D Double
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{ fitPoint :: !( Point2D Double )
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, fitTangent :: !( Vector2D Double )
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}
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deriving stock ( Show, Generic )
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deriving anyclass NFData
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@ -138,9 +138,14 @@ fitSpline ( FitParameters {..} ) = go 0
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| subdiv >= maxSubdiv
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|| sq_d <= dist_tol ^ ( 2 :: Int )
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-> ( Seq.singleton bez, ( FitTangent p tp :<| Seq.fromList ( map FitPoint qs ) ) :|> FitTangent r tr )
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| otherwise
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-> go ( subdiv + 1 ) ( \ t -> curve $ t * t_split )
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<> go ( subdiv + 1 ) ( \ t -> curve $ t_split + t * ( 1 - t_split ) )
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| let
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t_split_eff :: Double
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t_split_eff
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| t_split < 0.2 = 0.2
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| t_split > 0.8 = 0.8
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| otherwise = t_split
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-> go ( subdiv + 1 ) ( \ t -> curve $ t * t_split_eff )
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<> go ( subdiv + 1 ) ( \ t -> curve $ t_split_eff + t * ( 1 - t_split_eff ) )
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-- | Fits a single cubic Bézier curve to the given data.
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--
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@ -246,11 +251,13 @@ fitPiece dist_tol t_tol maxIters p tp qs r tr =
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| isNaN x
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|| isNaN y
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|| abs y > epsilon
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|| x < -epsilon
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|| x > 1 + epsilon
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-> modify' ( first ( const True ) ) $> ti
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| otherwise
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-> when ( abs ( x - ti ) > t_tol )
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( modify' ( first ( const True ) ) )
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$> x
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$> ( min 1 $ max 0 x )
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let
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sq_dist :: Double
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sq_dist = quadrance @( Vector2D Double ) q ( Cubic.bezier @( Vector2D Double ) bez ti' )
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@ -74,7 +74,9 @@ import qualified Math.Bezier.Quadratic as Quadratic
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import Math.Epsilon
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( epsilon )
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import Math.Module
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( Module((^-^), (*^)), Inner((^.^)), lerp )
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( Module((^-^), (*^)), Inner((^.^))
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, lerp, squaredNorm
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)
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import Math.Roots
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( realRoots )
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import Math.Vector2D
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@ -227,18 +229,33 @@ stroke params allPts@( spt0 :<| spt1 :<| spts )
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brush t = lerpBrush t ( brushShape @x sp0 ) ( brushShape @x sp1 )
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fwd, bwd :: Double -> ( Point2D Double, Vector2D Double )
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fwd t
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= ( offset ( withTangent tgt ( brush t ) )
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• lerp @( Vector2D Double ) t p0 p1
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, tgt -- wrong
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= ( off t
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, if squaredNorm offTgt < epsilon then tgt else offTgt
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)
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where
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off :: Double -> Point2D Double
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off x = offset ( withTangent tgt ( brush x ) ) • lerp @( Vector2D Double ) x p0 p1
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offTgt :: Vector2D Double
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offTgt
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| t < 0.5
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= 1e9 *^ ( off t --> off (t + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (t - 1e-9) --> off t )
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bwd t
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= ( offset ( withTangent ( (-1) *^ tgt ) ( brush s ) )
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• lerp @( Vector2D Double ) s p0 p1
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, (-1) *^ tgt -- wrong
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= ( off s
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, if squaredNorm offTgt < epsilon then (-1) *^ tgt else offTgt
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)
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where
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s :: Double
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s = 1 - t
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off :: Double -> Point2D Double
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off x = offset ( withTangent ( (-1) *^ tgt ) ( brush x ) ) • lerp @( Vector2D Double ) x p0 p1
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offTgt :: Vector2D Double
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offTgt
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| s < 0.5
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= 1e9 *^ ( off s --> off (s + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (s - 1e-9) --> off s )
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= do
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fwdIVar <- Par.spawnP ( fitCurve fwd )
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bwdIVar <- Par.spawnP ( fitCurve bwd )
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@ -265,18 +282,33 @@ stroke params allPts@( spt0 :<| spt1 :<| spts )
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( Quadratic.Bezier ( brushShape @x sp0 ) ( brushShape @x sp1 ) ( brushShape @x sp2 ) )
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fwd, bwd :: Double -> ( Point2D Double, Vector2D Double )
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fwd t
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= ( offset ( withTangent ( Quadratic.bezier' bez t ) ( brush t ) )
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• Quadratic.bezier @( Vector2D Double ) bez t
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, Quadratic.bezier' bez t -- wrong
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= ( off t
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, if squaredNorm offTgt < epsilon then Quadratic.bezier' bez t else offTgt
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)
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where
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off :: Double -> Point2D Double
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off x = offset ( withTangent ( Quadratic.bezier' bez x ) ( brush x ) ) • Quadratic.bezier @( Vector2D Double ) bez x
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offTgt :: Vector2D Double
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offTgt
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| t < 0.5
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= 1e9 *^ ( off t --> off (t + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (t - 1e-9) --> off t )
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bwd t
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= ( offset ( withTangent ( (-1) *^ Quadratic.bezier' bez s ) ( brush s ) )
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• Quadratic.bezier @( Vector2D Double ) bez s
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, (-1) *^ Quadratic.bezier' bez s -- wrong
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= ( off s
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, if squaredNorm offTgt < epsilon then (-1) *^ Quadratic.bezier' bez s else offTgt
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)
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where
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s :: Double
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s = 1 - t
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off :: Double -> Point2D Double
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off x = offset ( withTangent ( (-1) *^ Quadratic.bezier' bez x ) ( brush x ) ) • Quadratic.bezier @( Vector2D Double ) bez x
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offTgt :: Vector2D Double
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offTgt
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| s < 0.5
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= 1e9 *^ ( off s --> off (s + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (s - 1e-9) --> off s )
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= do
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fwdIVar <- Par.spawnP ( fitCurve fwd )
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bwdIVar <- Par.spawnP ( fitCurve bwd )
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@ -305,18 +337,33 @@ stroke params allPts@( spt0 :<| spt1 :<| spts )
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( Cubic.Bezier ( brushShape @x sp0 ) ( brushShape @x sp1 ) ( brushShape @x sp2 ) ( brushShape @x sp3 ) )
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fwd, bwd :: Double -> ( Point2D Double, Vector2D Double )
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fwd t
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= ( offset ( withTangent ( Cubic.bezier' bez t ) ( brush t ) )
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• Cubic.bezier @( Vector2D Double ) bez t
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, Cubic.bezier' bez t -- wrong
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= ( off t
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, if squaredNorm offTgt < epsilon then Cubic.bezier' bez t else offTgt
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)
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where
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off :: Double -> Point2D Double
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off x = offset ( withTangent ( Cubic.bezier' bez x ) ( brush x ) ) • Cubic.bezier @( Vector2D Double ) bez x
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offTgt :: Vector2D Double
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offTgt
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| t < 0.5
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= 1e9 *^ ( off t --> off (t + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (t - 1e-9) --> off t )
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bwd t
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= ( offset ( withTangent ( (-1) *^ Cubic.bezier' bez s ) ( brush s ) )
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• Cubic.bezier @( Vector2D Double ) bez s
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, (-1) *^ Cubic.bezier' bez s -- wrong
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= ( off s
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, if squaredNorm offTgt < epsilon then (-1) *^ Cubic.bezier' bez s else offTgt
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)
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where
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s :: Double
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s = 1 - t
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off :: Double -> Point2D Double
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off x = offset ( withTangent ( (-1) *^ Cubic.bezier' bez x ) ( brush x ) ) • Cubic.bezier @( Vector2D Double ) bez x
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offTgt :: Vector2D Double
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offTgt
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| s < 0.5
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= 1e9 *^ ( off s --> off (s + 1e-9) )
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| otherwise
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= 1e9 *^ ( off (s - 1e-9) --> off s )
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= do
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fwdIVar <- Par.spawnP ( fitCurve fwd )
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bwdIVar <- Par.spawnP ( fitCurve bwd )
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